DTC : U0199, U128D (MICU) (2016 2017 2018)

DTC U0199  : MICU lost communication with power window master switch

DTC U128D  : MICU lost communication with gauge control module

DTC (MICU)

NOTE:  If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .

1. Problem verification

   -1. Clear the DTCs with the HDS.

   Clear DTCs

   - 2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

   - 3. Wait for at least 6 seconds.

   - 4. Check for DTCs with the HDS.

   DTC Description	DTC
   U0199 MICU lost communication with power window master switch
   U128D MICU lost communication with gauge control module

   Are DTC U0199 or U128D indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections.

2. Open wire check (B-CAN_H, B-CAN_L lines)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connector.

   Under-dash fuse/relay box connector M (12P)

   - 3. Disconnect the transmitting control unit connectors.

   Gauge control module 32P connector

   Power window master switch 37P connector

   - 4. Check for continuity between the receiving control unit and the transmitting control unit on the B-CAN_H circuit and the B-CAN_L circuit as specified in the table while in the vehicle OFF (LOCK) mode.

   DTC	CIRCUIT NAME	RECEIVING CONTROL UNIT	TRANSMITTING CONTROL UNIT
   U0199 MICU lost communication with power window master switch	B-CAN_H	Under-Dash Fuse/Relay Box Connector M (12P) No. 7	Power window master switch 37P connector No. 28 Refer to: Power Window Master Switch Connector for Inputs and Outputs (2016 2017 2018)
   	B-CAN_L	Under-Dash Fuse/Relay Box Connector M (12P) No. 1	Power window master switch 37P connector No. 30 Refer to: Power Window Master Switch Connector for Inputs and Outputs (2016 2017 2018)
   U128D Keyless Access Control Unit Lost Communication with Gauge Control Module	B-CAN_H	Under-Dash Fuse/Relay Box Connector M (12P) No. 7	Gauge control module 32P connector No. 26 Refer to: Gauge Control Module Connector for Inputs and Outputs (2016 2017 2018)
   	B-CAN_L	Under-Dash Fuse/Relay Box Connector M (12P) No. 1	Gauge control module 32P connector No. 27 Refer to: Gauge Control Module Connector for Inputs and Outputs (2016 2017 2018)

   Is there continuity?

   YES 

   The B-CAN_L to B-CAN_H wire is OK. Go to step 3.

   NO 

   Repair an open or high resistance in the B-CAN_H and/or B-CAN_L wire (S) between the receiving control unit and the transmitting control unit.

3. Determine possible failure area (the receiving control unit or the transmitting control unit)

   -1. Reconnect all connectors.

   - 2. Turn the vehicle to the OFF (LOCK) mode.

   -3. Clear the DTCs with the HDS.

   Clear DTCs

   - 4. Check for DTCs with the HDS.

   DTC Description	DTC
   U0199 MICU lost communication with power window master switch
   U128D MICU lost communication with gauge control module

   Are DTC U0199 and U128D indicated?

   YES 

   Check for loose terminals and poor connections in the under-dash fuse/relay box connector. Check is OK, replace the Under-Dash Fuse/Relay Box - Removal and Installation .

   NO 

   The MICU is OK at this time. Replace the transmitting control unit. (Refer to the DTC code shown on the display, and then replace the control unit based on the instructions in the table below.)

   DTC	TRANSMITTING CONTROL UNIT
   U0199 MICU lost communication with power window master switch	Replace Power Window Master Switch - Removal and Installation
   U128D MICU lost communication with gauge control module	Replace Gauge Control Module - Removal and Installation